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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
	<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
	<title>Document</title>
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<body>
	<script type="text/javascript">
	    var haha=250;
	    var xixi=300;
	    var a1=400;
	    var abc_123=410;
	    var $abc=1000;
	    console.log($abc);
//	    变量名只能有英语字母,数字,下划线,美元符号构成,不能数字开头
	</script>
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